KIEV, June 4 (Xinhua) -- Ukrainian President Volodymyr Zelensky on Wednesday described Russia's memorandum on ceasefire as an "ultimatum" to Ukraine, the Interfax-Ukraine news agency reported.

在法国总统埃马纽埃尔·马克龙（Emmanuel Macron）对新加坡进行正式国事访问期间，一项具有里程碑意义的国际能源合作谅解备忘录（Memorandum of Understanding，MoU）正式签署。